Rig for drilling wells



2 Sheets-Sheet 1.

(No Model.)

G. CORBETT. RIG FOR. DRILLING WELLS.

Patented May 20, 1890.

INVENTOR WITNESSES:

g M a W" (No Model.) 2 Sheets-Sheet 2. i

G. OORBETT. RIG FOR DRILLING WELLS.

No. 428,461. Patented May 20, 1890.

26 Fig All. I

7 W/T/VESSES: I

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UNITED STATES PATENT DEEICE.

GEORGE CORBET'I, OF BRADFORD, PENNSYLVANIA.

RIG FOR DRILLING WELLS.

SPECIFICATION formingpart of Letters Patent No. 428,461, dated May 20, 1890.

Application filed August 9, 1838. Serial No. 282,302. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE CORBETT, a citizen of the United States, residing at Bradford, county of McKean, and State of Pennsylvania, have invented certain new and useful Improvements in Rigs for Drilling WVells, of which the following is a specification.

My invention relates to improvements in portable rigs for drilling Artesian and other wells, and will first be described with reference to the accompanying drawings, which form an important partof the specification, and then more specifically pointed out in the claims hereto annexed.

In the said drawings, Figure I is a side elevation of my portable drilling-rig. Fig. II represents a front elevation of the mast or derrick. Fig. III represents a portion of the mast supporting a segment walking-beam connected by a pitman to the crank, the dotted lines showing said walking-beam disconnected from the crank and swung up out of the way in the position it assumes when the tools are being drawn from the well. Fig. IV represents a face view of the stirrup with the upper portion of the pitman attached. (Shown in Fig. III.) Fig. V is a front elevation of the back brake-post, showing the back brake connected thereto by-means of an angle-iron or bracket, the lower portion being broken away. Fig. VI represents a top elevation of the rig, the mast or derrick being in section. Fig. VII represents the crankbeam hereinafter described. Fig. VIII represents the pulley or saddle carried by the crank-beam. Fig. IX is a side elevation of the tightening mechanism, as hereinafter fully described. Fig. X is a detail view showing the mannerof supporting said tightening mechanism.

A represents the mast or derrick, in the crown of which is j ournaled a large pulley a, and at a suitable distance below this pulley is secured to the mast a cross-bar a, having mounted in each end smaller pulleys a and a respectively.

My object in so arranging these pulleys is twofold: first, to enlarge the bend of the drilling-cable B, whereby the strands are less liable to break, as often happens when running over a small pulley under heavy strain, and, second, the drilling-tools can thus be sus pended a sufficient distance away from the rig to afford ample room for the workmen around the well-hole Z).

a is a sand-pump pulley suspended from the cross-bar a, and a is the guide-pulley for the sand-line W. The mast A and the frame restupon the mud-sills C and C and the mast is braced by means of the braces O C, secured thereto and to the mud-sill O.

The frame of this improved rig is practically the same as that shown and described in my United States Letters Patent No. 385,241, and will therefore not require a detailed description here. v

Extending athwart the machine is the driving-shaft d, which carries at one end the driving-pulley D and at the other a crank F. Mounted upon this shaft is a combined pulley and friction-wheel d, having to one side of its periphery a peripheral groove 6', and mounted upon the bull-wheel shaft 2 directly opposite is a similar wheel E, which, however, I will hereinafter term a combined pulley and brake wheel. This wheel E is likewise provided to one side of'its periphery with a peripheral groove 6 and at the other side it is provided with a groove in which engages a brake-band E hereinafter described. Passing around these wheels E and d and resting in the grooves e e is a belt or rope e, which is adapted to impart motion from the drivingshaft to the bull-wheel, which, it will be understood, is formed by the two flanges 0r wheels 3 4 and the shaft 2, upon which they are mounted.

Projecting upwardly from the sill J are two standards J and J which carry at their upper ends a sleeve K, having a flange at its outer end, as shown in Fig. X, anda bracket at its inner end,bymeans of which the sleeve is secured to the posts J and J 2 by bolts, as shown. J ournaled to this sleeve K is a horizontal lever (1 having in its lower edge acutaway portion, so as to form a bearing for the sleeve, and a block (Z secured thereto and engaging at the under side of such sleeve, so as to form a complete bearing. To one end of this lever (Z is secured an upwardly-projecting arm d, which carries at its upper extremity a horizontal shaft (1 upon which is journaled directly over the belt or rope e a friction-wheel d, and at the other end of such lever is secured an extension-arm (i having the operating-handle (1 The gudgeons of the bull-wheel shaft 2 are journaled in rigid vertical posts or standards E and E planted upon the mud-sill C, and the post E 'is braced by means of a bar II secured to it and to the other mud-sill 0 Secured to the side of the post E is the brakepost E upon the inside of which is secured an angle-iron or bracket E to which latter the upper end of the brake-band E issecured, while the lower end of such band, after passing around the brake-wheel, is secured to a pin or lug e projecting from the end of the horizontal lever d By this arrangement it will be seen that when the operating-handle d is moved in one direction the f riction-wheel (1 will depress the upper fold of the rope or belt e, thus making sufficient friction between such belt and the two wheels (1 and E to impart motion from the revolving wheel (Z to the wheel E, and consequently to the bullwheel, and at the same time the lower end of the brake-band will be lowered and the brake loosened upon the brake-wheel, and when such handle (1 is operated in the opposite direction the friction-wheel (1 will relieve the belt 6, allowing it to become sufficiently slack to enable the wheel (I to revolve without imparting motion to the wheel E, and the lower end of the brake-band F. will be raised, and such band consequently pressed firmly against the wheel E, and thus check the revolutions of the bull-wheel.

L is a sand-reel which is mounted at one end in a fixed bearing M and at the other end in a swinging lever N. To the lower end of this lever is attached the operating-handle O, by means of which the sand-reel frictionwheel N may be forced into engagement with the friction-wheel (Z or with the back brake-block P. This arrangementis substantially the same as that shown and described in my United States Letters Patent aforesaid, to which reference may be had for a more full explanation of this feature.

F is a beam, which I shall he! einafter term a crank-beam. This beam is supported or pivoted at one end, by means of the bolt or shaft G, to the end of the plate or frame G. The bolt is held in place on such plate by means of the block G and it is secured to the crank-beam by a similar block F, the upper edge of the crankbeam,however, being provided with a series of countersinks, the bolt being secured in any one of these countersinks, according to the distance it is desired to have the beam project from its pivot. This beam is composed of two parts, the upper one of which being a straight strip suitably bolted to the lower one, which latter is provided with an elongated notch in its upper edge, whereby the slot F is formed. Secured on the wrist-pin of the crank F is a frictionroller F, which engages in this slot, and is provided with a washer at its outer extremity for preventing the crank-beam from becoming displaced, the slot F being of sufficient length to allow the crank to make an entire revolution and carry the beam with it; or, in other words its length is greater than the diameter of the circle described by the wrist-pin, so that the latter will not come against the ends of the slot when the beam is shortened or lengthened. At the upper extremity of this beam is secured a saddle, (shown in Fig. VIIL) which is composed of the hook-shaped bracket F carrying a friction-pulley F which latter is adapted to be hooked over the drilling-rope B, the slot being between the said saddle and the pivotal point of the beam. Thus it will be seen that when motion is imparted to the driving-shaft the crank F will cause the said crank-beam to rise and fall with a rapid and regular movement and impart to the drilling-rope the desired drilling motion.

This method of raising and lowering tools when drilling is advantageous for the reason that it performs the work with the utmost precision and entirely avoids the jerk or snap action of the treadle-machines.

The arrangement just described is more particularly adapted for the initial drilling that is, drilling until the tool sinks sufii ciently into the earth to permit of attaching the drilling-rope to the walking segment-beam Q, Fig. III, in the manner fully shown and described in my United States Letters Patent No. 306,544, granted January 22, 1889. After this initial drilling is performed I release the drilling-rope from the pulley F in the bracket F and remove the crank-beam F and then attach the pitman S, secured to one end of the beam Q, to the crank F and the segment to the drilling-rope by means of a clamp, as fully shown and described in my aforesaid patent. The beam Q is supported or j on rnaled in pillow-blocks a on the mast or derrick, and the beam is connected to the pitman S by means of a-stirrup R. The side straps of this stirrup are of considerable length, as shown, in order that the walking beam may be folded as nearly as practicable parallel with the mast or derrick out of the way when the drilling is being performed by other means, as described.

'When the band or belt 6 is not in use, it may, if desired, be suspended upon a hook or support E on the inner side of the brakepost E.

It will of course be understood that the belt e is only used when it is desired to raise the of this crank-beam a longer stroke is obtained than can be had by direct connection to the wrist-pin, and the drilling motion is noiseless and exceedingly steady.

I claim 1. In a drilling-rig, the combination, with the driving-shaft and dri11ing-rope, of a crank on said shaft, a crank-beam adjustably pivoted at one end, the saddle secured at the other end of said beam and bearing on the drilling-rope, said crank-beam having a slot between its pivotal point and said saddle, and a wrist-pin on said crank engaging in said slot, the length of said slot being greater than the diameter of the circle described by said wrist-pin, substantially as and for the purposes set forth.

2. In a drilling-rig, the combination, with the wheels d and E, of the brake-post E a belt surrounding said wheels, 21 standard, a lever pivoted in said standard, the arm d on said lever, the bracket E secured to said post and overhanging the wheel E, a strap-brake secured to said bracket at one end and partially surrounding the wheel E, the lug 6 secured to the other end of said brake, the shaft 61 carried by said arm (Z and projecting axially over the wheel (Z, and a pulley on said shaft adapted to depress said belt,.substantially as set forth.

3. In a drilling-rig, the combination, with the posts J J 2 and the shaft (1, of the sleeve K,

surrounding said shaft and having a flange at each end, bolts passing through one of said flanges and securing said posts and sleeve to- 3 5 gether, and the lever d journaled upon said sleeve between said flanges, as set forth.

4. The combination, with the bull-wheel and drilling-rope, of the slotted crank-beam adjustable endwise, the crank having a pin 40 engaging in said slot, and said slot being longer than the stroke of said crank, a bracket projecting upwardly from said beam, and a pulley journaled in said bracket and engaging over the drilling-rope, whereby the rope may be released from said pulley at will, substantially as set forth.

5. In a drilling-rig, the combination, with the driving-shaft and the drilling-rope, of a crank on said shaft, the slotted crank-beam F pivoted at one end, whereby it maybe adjusted endwise, a Wrist-pin projecting from said crank and engaging in said slot, said slot being greater in length than the diameter of the circle described by said pin, and a saddle 

